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Drill Press question on bits, speed

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Forum topic by bvdon posted 08-20-2011 04:09 AM 892 views 0 times favorited 7 replies Add to Favorites Watch
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bvdon

481 posts in 2475 days


08-20-2011 04:09 AM

Topic tags/keywords: question drill bits speed

I am always having problems with my drill press in that when I am drilling a piece of wood (doesn’t seem to matter what kind) and the bit is exiting the other side it is a very harsh exit. If I don’t clamp the piece down it will catch onto the bit and start spinning. Even clamped down I can feel that sudden jerk when it get through.

I am using wood bits from the big box store with a pilot point.

Any suggestions on speed or better bits?

Thanks.

-- http://woodwork.me


7 replies so far

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Gary

8968 posts in 2892 days


#1 posted 08-20-2011 04:12 AM

Im not the expert here but, sounds like too much pressure. I usually go slowly, especially when it gets to the end of the drilling

-- Gary, DeKalb Texas only 4 miles from the mill

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bvdon

481 posts in 2475 days


#2 posted 08-20-2011 04:20 AM

I do that and always backing out to remove loose material.

-- http://woodwork.me

View gfadvm's profile

gfadvm

14940 posts in 2150 days


#3 posted 08-20-2011 04:24 AM

Use a brad point bit with a smooth/flat backer board clamped to the underside of the workpiece and go slow as you exit the back side. Speed depends on the diameter of your drill bit. Large bits over 1” or so are best used at slower speeds. You can also drill almost through and then flip the board and finish drilling from the back side to eliminate tearout.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

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bvdon

481 posts in 2475 days


#4 posted 08-20-2011 09:16 AM

Thanks for the info.

-- http://woodwork.me

View Tootles's profile

Tootles

780 posts in 1961 days


#5 posted 08-20-2011 09:44 AM

What does the surface that you are resting you wood on look like? It needs to support the bottom of the wood well. If it has too many holes from previous drilling, it needs to be replaced.

Mostly I use high speed twist drills, which technically are designed for steel, even for wood. You seldom get any “catch” as you exit and since they do not rely on a pilot point, it is possible to drill a series of holes of increasing size if you do experience problems.

-- I may have lost my marbles, but I still have my love of woodworking

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ajosephg

1878 posts in 3021 days


#6 posted 08-20-2011 12:13 PM

You need a backer board.

-- Joe

View richgreer's profile

richgreer

4541 posts in 2534 days


#7 posted 08-20-2011 04:04 PM

4 points – - (1) Backer board, (2) back out often to clear the chips, (3) light downward pressure, especially, at the end and most importantly (4) a sharp bit.

IMO – Too many people don’t think enough about the importance of sharpness on power tools, especially drill bits used in drill presses.

FWIW – I use primarily brad points and forstner bits and I usually run the drill press slower than the officially recommended speed. For me, it just feels better.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

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